Configuration Guide Configuring IPv6
(ESP). AH provides data integrity and authenticates IP packet sources to ensure that the packets originate from the nodes
identified by the source addresses. ESP provides data encryption to realize end-to-end encryption.
Better QoS Support
A new field in the IPv6 packet header defines how to identify and process data streams. The Flow Label field in the IPv6
packet header is used to authenticate a data flow. Using this field, IPv6 allows users to propose requirements on the
communication quality. , A device can identify all packets belonging to a specific data stream based on this field and
process these packets according to user requirements.
New Protocol for Neighboring Node Interaction
IPv6 Neighbor Discovery Protocol (NDP) uses a series of Internet Control Message Protocol Version 6 (ICMPv6) packets
to implement interactive management of neighboring nodes (nodes on the same link). IPv6 uses NDP packets and
efficient multicast/unicast ND packets instead of broadcast-based Address Resolution Protocol (ARP) and Control
Message Protocol Version 4 (ICMPv4) router discovery packets.
Extensibility
With strong extensibility, IPv6 features can be added to the extended packet header following the IPv6 packet header.
Unlike IPv4, the IPv6 packet header can support at most 40 bytes of options. For an IPv6 packet, the length of the
extended packet header is restricted only by the maximum number of bytes in the packet.
Protocols and
Standards
RFC 4291 - IP Version 6 Addressing Architecture
RFC 2460 - Internet Protocol, Version 6 (IPv6) Specification
RFC 4443 - Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification
RFC 4861 - Neighbor Discovery for IP version 6 (IPv6)
RFC 4862 - IPv6 Stateless Address Auto-configuration
RFC 5059 - Deprecation of Type 0 Routing Headers in IPv6
3.2 Applications
Communication Based on IPv6
Addresses
Two PCs communicate with each other using IPv6 addresses.
3.2.1 Communication Based on IPv6 Addresses
Scenario
As shown in Figure 3-1, Host 1 and Host 2 communicate with each other using IPv6 addresses.
Figure 3-1
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